MCAT Basics (from MedSchoolCoach) Molecular Structure and Absorption Spectra
Feb 12, 2026
Delve into the fascinating world of molecular structure and spectroscopy. Discover how Nuclear Magnetic Resonance (NMR) reveals the secrets of hydrogen and carbon bonds. Learn to identify functional groups through Infrared (IR) spectroscopy and how peaks relate to molecular vibrations. Explore UV-Vis spectroscopy's role in quantifying compounds and its connection to visible light. Uncover the mysteries of mass spectrometry, including molecular weight determination. This podcast is a must-listen for anyone aiming to master the MCAT!
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Limonene Extraction From Organic Lab
- Sam recalls the lemonene extraction from orange peel as a lab example for spectroscopy.
- He used IR to compare the isolated compound's spectrum to reference spectra to confirm identity.
Memorize High-Yield IR Peaks
- Memorize key IR peaks: ~1700 cm⁻¹ (carbonyl), ~3300 cm⁻¹ (O–H), ~2100 cm⁻¹ (triple bond), ~3000 cm⁻¹ (C–H).
- Remember broad peaks often indicate hydrogen bonding and the fingerprint region is below 1300 cm⁻¹.
Color Equals Complement Of Absorbed Light
- A compound's color equals the complementary color to the wavelength it absorbs most strongly.
- Use the ROYGBIV color wheel to pick opposites (e.g., absorbs orange → appears blue).